// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_GL_GL_STATE_RESTORER_H_
#define UI_GL_GL_STATE_RESTORER_H_

#include "base/macros.h"
#include "ui/gl/gl_export.h"

namespace gpu {
namespace gles2 {
    class GLES2Decoder;
} // namespace gles2
} // namespace gpu

namespace gfx {

// An interface for Restoring GL State.
// This will expand over time to provide an more optimizable implementation.
class GL_EXPORT GLStateRestorer {
public:
    GLStateRestorer();
    virtual ~GLStateRestorer();

    virtual bool IsInitialized() = 0;
    virtual void RestoreState(const GLStateRestorer* prev_state) = 0;
    virtual void RestoreAllTextureUnitBindings() = 0;
    virtual void RestoreActiveTextureUnitBinding(unsigned int target) = 0;
    virtual void RestoreAllExternalTextureBindingsIfNeeded() = 0;
    virtual void RestoreFramebufferBindings() = 0;
    virtual void PauseQueries() = 0;
    virtual void ResumeQueries() = 0;

    DISALLOW_COPY_AND_ASSIGN(GLStateRestorer);
};

} // namespace gfx

#endif // UI_GL_GL_STATE_RESTORER_H_
